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Ophthalmologic apparatus and ophthalmologic method

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Ophthalmologic apparatus and ophthalmologic method


In order to automatically determine whether an eye to be inspected is an IOL eye by using bright spot images on a cornea for inspection at high accuracy, an ophthalmologic apparatus is provided with: a light beam projecting unit for projecting a light beam on the cornea of the eye to be inspected; a light receiving unit including an image pickup element for receiving a reflection light beam obtained by reflection of the light beam projected by the projecting unit to obtain cornea bright spot images from the cornea of the eye to be inspected; and an IOL eye determining unit for determining whether the eye to be inspected is the IOL eye based on the cornea bright spot images received by the light receiving unit.
Related Terms: Cornea Inspect

USPTO Applicaton #: #20140028978 - Class: 351208 (USPTO) -


Inventors: Wataru Sakagawa, Kazuaki Umekawa, Hiroshi Itoh

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The Patent Description & Claims data below is from USPTO Patent Application 20140028978, Ophthalmologic apparatus and ophthalmologic method.

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BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to an ophthalmologic apparatus for measuring ocular characteristics of an eye to be inspected or acquiring an image of the eye to be inspected, and to an ophthalmologic method for obtaining the ocular characteristics of the eye to be inspected.

2. Description of the Related Art

In recent years, with the popularization of intraocular lenses (IOL) used for cataract surgeries, there are an increased number of an eye to be inspected having an intraocular lens implanted therein (IOL eye). An IOL has different characteristics than a crystalline lens in terms of its shape and material, the presence/absence of refractive power adjustability, and the like. Therefore, in order to inspect the IOL eye with high accuracy, an apparatus needs to acquire information on whether the eye to be inspected is the IOL eye.

There has been known a technology in which, in an ophthalmologic reflectometer, an inspector provides an input on whether the eye to be inspected is the IOL eye to the reflectometer and the reflectometer switches the function of a jog dial depending on the input (Japanese Patent No. 3244873). Therefore, for the IOL eye that generally tends to undergo miosis, the inspector may adjust the light amount of a fixation target with the jog dial.

There has been known a technology in which, in an ophthalmologic image acquiring apparatus, the apparatus determines, based on the color of the flare, whether the eye to be inspected is the IOL eye to switch the focusing method (Japanese Patent Application Laid-Open No. 2003-290146). Therefore, precise focusing can be performed for the IOL eye that generally tends to generate the flare.

There has also been known a technology in which, in an apparatus for measuring eye axial length, the apparatus determines, based on reflection signals from an anterior ocular segment of the eye to be inspected, whether the eye to be inspected is the IOL eye to use a more appropriate method for calculating the eye axial length (Japanese Patent Application Laid-Open No. 2011-136109).

Meanwhile, there has been known a technology in which, irrespective of whether the eye to be inspected is the IOL eye, for the purpose of preventing malfunction of an alignment operation, images in an on state and an off state of a light source are compared (Japanese Patent Application Laid-Open No. 2009-172155).

However, it has not been possible for the apparatus to use a bright spot image on a cornea to automatically determine whether the eye to be inspected is the IOL eye. Therefore, even with an apparatus that can obtain the bright spot image on the cornea, it has been necessary for the inspector to provide the input on whether the eye to be inspected is the IOL eye as in the configuration disclosed in Japanese Patent No. 3244873, and there has been a risk that the inspection fails due to a mistake or an input error of the inspector. There have also been problems in that such input operation places a burden on the inspector and in that the measurement time increases.

SUMMARY

OF THE INVENTION

The present invention has been made in view of the above-mentioned circumstances, and therefore is to provide an ophthalmologic apparatus or an ophthalmologic method that enables automatic determination of whether an eye to be inspected is an IOL eye by utilizing bright spot images on a cornea.

Note that, without limiting to the above-mentioned apparatus and method, providing actions and effects that are obtained by configurations described below in the “Description of the Embodiments” section and that cannot be obtained by the conventional technologies can also be regarded as another aspect of the present invention.

In order to solve the above-mentioned problems, an ophthalmologic apparatus according to one embodiment of the present invention includes: a projecting unit for projecting a light beam to an eye to be inspected; and a determining unit for determining whether or not a bright spot image based on a reflection light beam obtained by reflection of the light beam on the eye to be inspected is a bright spot image generated by an intraocular lens.

According to the present invention, the automatic determination on whether the eye to be inspected is the IOL eye is enabled by utilizing the bright spot images on the cornea. Therefore, the risk that the inspection fails due to the mistake or the input error of the inspector is reduced, and because the input operation is unnecessary, effects that the burden on the inspector is reduced and that the inspection time may be reduced may be obtained.

Further features of the present invention will become apparent from the following description of exemplary embodiments with reference to the attached drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram illustrating an example of an appearance of an ophthalmologic reflectometer according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating an example of an optical system arrangement of the first embodiment illustrated in FIG. 1.

FIG. 3 is a perspective view illustrating an example of an alignment prism stop of the first embodiment illustrated in FIG. 1.

FIG. 4 is a diagram illustrating an example of system blocks of the ophthalmologic reflectometer according to the first embodiment of the present invention.

FIG. 5 is a diagram illustrating an example of image forming positions of bright spot images obtained by the ophthalmologic reflectometer exemplified in the first embodiment.

FIGS. 6A and 6B are diagrams illustrating examples of anterior ocular segment images obtained by the ophthalmologic reflectometer exemplified in the first embodiment, of which FIG. 6A illustrates an anterior ocular segment image of a non-IOL eye, and FIG. 6B illustrates an anterior ocular segment image of an IOL eye.

FIG. 7 is a flow chart illustrating an example of IOL eye determination in ophthalmologic image acquisition according to the first embodiment of the present invention.

FIGS. 8A and 8B are diagrams illustrating examples of anterior ocular segment images obtained by an apparatus according to a second embodiment of the present invention, of which FIG. 8A illustrates an anterior ocular segment image of a non-IOL eye, and FIG. 8B illustrates an anterior ocular segment image of an IOL eye.



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Previous Patent Application:
Ophthalmologic apparatus and alignment method
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Methods and apparatus to identify eye coverings for vision
Industry Class:
Optics: eye examining, vision testing and correcting
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stats Patent Info
Application #
US 20140028978 A1
Publish Date
01/30/2014
Document #
13950617
File Date
07/25/2013
USPTO Class
351208
Other USPTO Classes
351206, 351246
International Class
61B3/15
Drawings
8


Cornea
Inspect


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